碳掺氧缺型TiO_(2)纤维的无外碳源制备及光催化性能

Carbon-doped Oxygen-deficient TiO_(2) Fibers Synthesized without Adding External Carbon Sources and Their Photocatalytic Activity

采用溶胶-凝胶法,结合离心纺丝技术及水蒸气活化工艺制备了一种碳掺氧缺型TiO_(2)(C-TiO_(2)−n)纤维光催化剂.探究了C-TiO_(2)−n纤维的结构、组分、性质及碳掺杂对其光催化活性的影响.结果表明,在无外碳源引入的情况下,利用TiO_(2)前驱体中的有机组分作为碳源,可以实现对TiO_(2)的碳掺杂,且碳掺杂明显改善了光催化剂的光捕获能力并有效抑制了光生载流子的复合.在以水中偶氮染料活性艳红(X-3B)作为目标污染物的光催化降解实验中,C-TiO_(2)−n纤维展现了优良的光催化活性和循环稳定性.在可见光照射60 min后,其对X-3B的降解率达到96.99%,动力学常数为0.0556 min^(−1),是氧缺型TiO_(2)纤维的19.86倍.

The carbon-doped oxygen-deficient TiO_(2)(C-TiO_(2)−n)fiber photocatalysts were prepared by sol-gel method combined with centrifugal spinning technology and heat treatment under steam.The structure,component and properties of the C-TiO_(2)−n fibers as well as the effect of carbon doping on the photocatalytic activity of C-TiO_(2)−n fibers were investigated.The results confirm that the introduction of carbon into TiO_(2)can be realized using the organic components in the fiber precursor as carbon sources without the introduction of external carbon sources.The introduction of carbon components effectively improved the light harvesting ability of photocatalysts and inhibited the recombination of photoinduced carriers.In the photocatalytic degradation experiment with azo dye reactive brilliant red(X-3B)as the target pollutant,C-TiO_(2)−n fibers showed excellent photocatalytic activity and cycling stability.After visible light irradiation of 60 min,the degradation rate of X-3B over C-TiO_(2)−n fibers reached 96.99%,and the kinetic constant was 0.0556 min^(−1),19.86 times higher than that of TiO_(2)−n fibers.